Membrane Filtration of Wood Components − Investigation of Fouling Layer Characteristics using Fluid Dynamic Gauging
Licentiatavhandling, 2022
In this work, the in situ monitoring technique fluid dynamic gauging (FDG), was used to investigate the fouling behavior of two feed streams containing wood components: a liquor obtained when wood was treated using steam explosion (STEX) and a microcrystalline cellulose (MCC) suspension. The cross-flow ultrafiltration (UF) of STEX liquors was performed at 200 kPa transmembrane pressure (TMP) using 10 kDa polysulfone membranes, whereas
the cross-flow microfiltration (MF) of MCC suspensions was operated at 40 kPa TMP using 0.45 μm polyethersulfone membranes.
Experimental results show that FDG provides valuable information regarding membrane fouling in both cross-flow MF and UF. The FDG profiles obtained during the STEX liquor fouling experiments revealed that an initial thick fouling layer of high resistance was formed rapidly. After this initial phase, the resistance increased further but only gradually, which may be due to pore blocking and/or rearrangement of the structure of the fouling layer. These results also indicate that the highest resistance of the fouling layer is close to the membrane. In the MCC fouling experiments, highly resilient layers were formed close to the membrane surface, as supported by the presence of attractive energy regions at the close interparticle separations identified via molecular dynamics (MD) simulations. These results highlight how FDG, when complemented with MD simulations, can provide a better mechanistic understanding of the fouling behavior of streams containing wood components during cross-flow filtration.
fluid dynamic gauging
wood components
cross-flow filtration
steam explosion
microcrystalline cellulose
membrane fouling
Författare
Kenneth Gacutno Arandia
Chalmers, Kemi och kemiteknik, Kemiteknik
Development of a fluid dynamic gauging method for the characterization of fouling behavior during cross-flow filtration of a wood extraction liquor
Food and Bioproducts Processing: Transactions of the Institution of of Chemical Engineers, Part C,;Vol. 128(2021)p. 30-40
Artikel i vetenskaplig tidskrift
Fouling characteristics of microcrystalline cellulose during cross-flow microfiltration: Insights gained from fluid dynamic gauging and molecular dynamics simulations
Drivkrafter
Hållbar utveckling
Innovation och entreprenörskap
Ämneskategorier
Pappers-, massa- och fiberteknik
Kemiteknik
Styrkeområden
Energi
Utgivare
Chalmers